. With Λ. Accumet pH Meters, pH AND m v MEASURE MENTS ARE INSTANT AND EYE-SOOTHING THANKS TO SHARP, CLEAR DIGITAL READOUT ... CERTAIN BECAUSE SELFDIAGNOSING CIRCUITS KEEP THE SYSTEM HONEST ... PERPETUALLY ACCURATE AND STABLE DUE TO STATE-OF-THEART SOLID STATE CIR CUITS ... TROUBLE-FREE AS THESE RUGGED METERS WORK ON AND ON WITHOUT BREAK DOWNS ... COMFORT ABLE BECAUSE THE METER FACE SWIVELS TO YOUR LINE OF VISION ... AMBIDEXTROUS SINCE ELECTRODES MOUNT ON LEFT OR RIGHT... FORWARD LOOKING WITH CONTROLS ON FRONT; JACKS AND TER MINALS ON TOP...NOT USING BUFFERS TO RESTANDARDIZE BE CAUSE ONCE THE METER IS STANDARDIZED FOR A SPECIFIC BUFFER, THAT SAME SETTING CAN BE DIALED IN LATER ... IN SHORT, ALL THE SIMPLICITY, PRE CISION AND RELIABILITY MODERN ENGINEERING CAN OFFER. YOUR CHOICE OF 5 DIFFERENT MODELS FOR EVERY THING FROM SUPEREXACT RESEARCH TO EVERYDAY ROUTINE. FOR BULLETIN DESCRIBING THE EXCEPTIONAL ACCUMET 5, WRITE: 711 FORBES AVE., PITTSBURGH, PA. 15219.
Fisher Scientific Co.
T-939 CIRCLE 7 9 O N READER SERVICE CARD
New Products Disposable multipurpose gas samplers p e r m i t collection of g a s e o u s or vapor samples without using sampling pumps or syringes. Valve d e s i g n allows use on high-pressure lines as well as a m b i e n t areas. Capacity is 370 cc. Case of six costs $21; d i s c o u n t s for larger q u a n t i t i e s . MDA Scientific, Inc. 312-696-4250 411 DR-EL/2 (direct-reading engineer's lab oratory) is a p o r t a b l e t e s t kit for t e s t i n g w a t e r at t h e source. Supplies a n d in s t r u c t i o n s for p e f o r m i n g 100 each of 27 w a t e r a n d w a s t e w a t e r t e s t s are i n c l u d e d . T e s t s are based on d i r e c t - r e a d i n g m e t e r scale used w i t h a solid-state spectro p h o t o m e t e r for c o l o r i m e t r i c d e t e r m i n a t i o n s . $530 w i t h o u t c o n d u c t i v i t y m e t e r . H a c h C h e m i c a l Co. 515-232-2533 412 Thermo-titrator uses an electronic detec t i o n circuit based on d e t e c t i o n of heat changes occurring during a titration. T h i s m e t h o d is said t o be a b o u t t h r e e t i m e s more a c c u r a t e in e n d - p o i n t deter m i n a t i o n t h a n present m e t h o d s . $1795. S a n d a , Inc. 215-839-0200 413
Separation Materials for High Speed Liquid Chromatography
• ADSORBENT • REVERSE PHASE • POLAR BONDED PHASE (NITRILE) • ANION EXCHANGE • CATION EXCHANGE All Vydachigh efficiency Materials feature:
Separation
• Solid Core • Chemically bonded thru Si-C Bond • Spheroidal particle shape • Thermally and hydrolytically stable • Compatible with both aqueous and organic solvents • Very simply dry packed DISTRIBUTORS:
Quantacomp provides rapid c o m p u t a t i o n a n d q u a n t i t a t i o n of data f r o m s c a n n i n g of chromatograms, electrophoretograms, a n d o t h e r s e p a r a t i o n m e d i a . Operation is by s i m p l e p u s h - b u t t o n c o n t r o l s , easily set dials, a n d i n s e r t i o n of plug-in m o d ules. T h e Q u a n t a c o m p provides rapid analog-to-digital c o n v e r s i o n a n d q u a n t i t a t i o n in p r i n t e d n u m e r i c a l f o r m . $3650. Schoeffel I n s t r u m e n t Corp. 201-664-7263
414 Single-pan lab balance w i t h t o r q u e m o t o r s y s t e m provides rapid r e a d o u t of w e i g h t s f r o m 0.001 t o 25.000 g r a m s . Accuracies of ± 0 . 1 % or r e a d i n g or ± 0 . 0 0 1 g r a m , w h i c h ever is greater, are o b t a i n e d . Leco Corp. 616-983-5531 415 X-ray microanalysis system is c o m p u t e r based a n d f e a t u r e s p u s h - b u t t o n opera t i o n , i n s t a n t peak c a l c u l a t i o n , a n d a u t o m a t i c e l e m e n t i d e n t i f i c a t i o n . It can be i n t e r f a c e d t o a w i d e range of d e t e c t o r a s s e m b l i e s a n d is ideal for analysis of SEM or electron m i c r o p r o b e s a m p l e d a t a . From $15,000. Nuclear Data, Inc. 312529-4600 416
A p p l i e d Science L a b o r a t o r i e s P.O. B o x 4 4 0 State College, Penna. 1 6 8 0 1 814/238-2406 C h r o m a t r o n i x Inc. 2 7 4 3 N i n t h Street B e r k e l e y , Calif. 9 4 7 1 0 415/871-7221
T o : The Sep/a/ra/tions Group 8 7 3 8 Oakwood Avenue Hesperia, California 9 2 3 4 5
714/244-3833 I am interested i n : Π V y d a c Adsorbent (liquid/solid) D V y d a c Reverse Phase (non-polar bonded phase) D V y d a c Polar Bonded Phase (Nitrile) D V y d a c A n i o n Exchange • V y d a c C a t i o n Exchange Name:... Title
Org. _.._ Phone... Add CIRCLE 194 O N READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 44, NO. 14, DECEMBER 1972
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